Hi,
I am struggling trying to render noise free refraction with Mantra.
And one thing that was recommended to me was to change the Stochastic path early cutoff to probability instead of Throughput. And it does help, a lot, but can anyone explain me what it does?
refractions indirect noise...cut off method.
2042 6 1-
- Nicolas Heluani
- Member
- 280 posts
- Joined: Dec. 2015
- Offline
-
- dlee
- Staff
- 431 posts
- Joined: Sept. 2016
- Offline
http://www.sidefx.com/docs/houdini/props/mantra [sidefx.com]
“Throughput” basically limits the number of indirect bounces based on estimated amount of contribution to the final image. “probability” is putting it in user's hand.
“Throughput” basically limits the number of indirect bounces based on estimated amount of contribution to the final image. “probability” is putting it in user's hand.
-
- Nicolas Heluani
- Member
- 280 posts
- Joined: Dec. 2015
- Offline
dlee
http://www.sidefx.com/docs/houdini/props/mantra [sidefx.com]
“Throughput” basically limits the number of indirect bounces based on estimated amount of contribution to the final image. “probability” is putting it in user's hand.
I see, so basically in probability with a cutoff threshold of 1 will basically never cut off early the stochastic ray sample while a value of 0.1 will give 10 % chance of cutting it off?
Edited by Nicolas Heluani - March 23, 2017 15:12:48
-
- dlee
- Staff
- 431 posts
- Joined: Sept. 2016
- Offline
-
- jsmack
- Member
- 7812 posts
- Joined: Sept. 2011
- Offline
-
- Nicolas Heluani
- Member
- 280 posts
- Joined: Dec. 2015
- Offline
dleeHehe…yes that's what I meant.
Value of 0.1 will give it 90% chance of terminating at each bounce.
Although… right now there's a bug where the cutoff threshold is being ignored entirely under “probability” mode. There seems to be a ticket for it already.
Thank you. I'm really trying to speed up my renderings with refractions and this helps a lot in understanding the cut off methods.
-
- dlee
- Staff
- 431 posts
- Joined: Sept. 2016
- Offline
-
- Quick Links